TO THE HYDRAULIC CALCULATION OF PRESSURE DRAINAGE PIPELINES, OPERATING IN DISTRIBUTION REGIME
A system of two differential equations which describes the movement of fluid in a pipe with a variable flow rate and the conditions for the fluid outflow through the walls of drainage pipelines into the surrounding soil is considered. It is reasoned that the second term in the original equation, which takes into account energy losses associated with a flow rate variation along the length, can be neglected without a substantial error. The considered system is reduced to dimensionless form by introducing original variables. The coefficient of collecting drainage pipeline resistance «ζl» and the generalized parameter «A», which take into account the structural and hydraulic characteristics of the considered flow, are two main parameters used in the analysis. The concept of an infinitely long drainage pipeline (a pipeline with an infinite walls filtration capacity) is introduced in the article. Also it is noted that such pipeline will have a maximum throughput comparing to pipes of the same diameter but limited length. Quite simple and practical calculated dependencies for the determination of the nature of flow rate variation and pressure drop along the length of the pipeline were received on the basis of the conducted analysis. Important characteristics of pressure distribution pipelines were calculated on the basis of offered formulas. Corresponding graphical dependencies were built for visibility. In particular, graphs of the flow rate variation at the end of the distributor, depending on the design and filtration characteristics of the «soil-drain» system, are presented. Graph that shows the dependence of the variation in the flow rate distribution unevenness along the length of the drainage pipe at various hydraulic conductivity values of the surrounding soil is important for understanding the drainage pipelines particularity. The necessity to take into account the nature of the flow rate connection unevenness along the length for obtaining reliable results for real drainage pipelines calculation is demonstrated.
2. Schultz, B., & De Wrachien, D. (2002). Irrigation and drainage systems research and development in the 21st century. Irrigation and Drainage, 51(4), 311–327. https://doi.org/10.1002/ird.67
3. Smedema, L.K., Abdel-Dayem S. & Ochs W.J. (2000). Drainage and agricultural development. Irrigation and Drainage Systems, 14, 223–235. https://doi.org/10.1023/A:1026570823692
4. Petrov, G.A. (1964). Variable mass hydraulics. Publishing house of Kharkiv University, 224.
5. Bezusiak, A.V., Dmitriev, A.F., & Pivovar, N.G. (1987). Hydraulic calculation of collectors-distributors. Melioration and water management, 67, 52–59.
6. Oleynik, O.Ya. & Poliakov, V.L. (1987). Wetlands drainage. Naukova dumka, 279.
7. Turcheniuk, V.O., Rokochуnskyі, A.M., Volk, P.P., Prуkhodko, N.V., & Rуchko D.M. (2018). Complex of measures to improve the efficiency of functioning of figured extractive systems. Bulletin of NUVGP. Technical sciences, 4(84), 3–21. https://doi.org/10.31713/vt420181
8. Mendus, P.I., Mendus, S.P., Turcheniuk, V.O., Filipchuk, B.A., & Rokochynskyi, A.M. Drainage on rice systems and complex assessment of its effectiveness. Bulletin of NUVGP. Technical sciences, 3(71), 3–21.
9. Kravchuk, A.M., & Kravchuk, O.A. (2020). Special issues of hydraulics of water supply and water sewerage systems: Tutorial. KNUCA, 175.
10. Kravchuk, A., Kochetov, G., & Kravchuk, O. (2020). Pipelines designing for steady water collection along the path. Problems of Water supply, Sewerage and Hydraulics, 33, 34–40. https://doi.org/10.32347/2524-0021.2020.33.34-40
11. Cherniuk, V.V., Ivaniv, V.V., & Tsenyuh, M.B. (2019). Dependence of non-uniformity of water inflow into pressure pipeline-collector on the angle of inflowing jets. Scientific Bulle-tin of UNFU, 29(9), 116–120. https://doi.org/10.36930/40290920
12. Kravchuk, O., Kravchuk, O. (2020). Evaluation of the impact of different head loss types on the collecting pipelines working characteristics. Problems of Water supply, Sewerage and Hydraulics, 34, 19–24. https://doi.org/10.32347/2524-0021.2020.34.19-24
13. Dvayt, G.B. (1977). Tables of integrals and other mathematical formulas. Translation from English by N.V. Levy, edited by K.A. Semendyaev. Nauka, 228.
14. Kravchuk, A., Kochetov, G., Kravchuk, O. (2020). Improving the calculation of collecting perforated pipelines for water treatment. Eastern-European Journal of Enterprise Technologies, 6(10). 23–28. https://doi.org/10.15587/1729-4061.2020.216366
The authors who publish in this collection agree with the following terms:
• The authors reserve the right to authorship of their work and give the magazine the right to first publish this work under the terms of license CC BY-NC-ND 4.0 (with the Designation of Authorship - Non-Commercial - Without Derivatives 4.0 International), which allows others to freely distribute the published work with a mandatory reference to the authors of the original work and the first publication of the work in this magazine.
• Authors have the right to make independent extra-exclusive work agreements in the form in which they were published by this magazine (for example, posting work in an electronic repository of an institution or publishing as part of a monograph), provided that the link to the first publication of the work in this journal is maintained. .
• Journal policy allows and encourages the publication of manuscripts on the Internet (for example, in institutions' repositories or on personal websites), both before the publication of this manuscript and during its editorial work, as it contributes to the emergence of productive scientific discussion and positively affects the efficiency and dynamics of the citation of the published work (see The Effect of Open Access).